runkit_function_redefine

(PECL runkit >= 0.7.0)

runkit_function_redefine — Replace a function definition with a new implementation

说明

runkit_function_redefine ( string $funcname , string $arglist , string $code [, bool $return_by_reference = NULL [, string $doc_comment = NULL ]] ) : bool

runkit_function_redefine ( string $funcname , Closure $closure [, string $doc_comment = NULL ] ) : bool

Note: 默认情况下，仅在用户空间可删除，重命名，或者修改函数。为了覆盖内部函数，必须启用 php.ini 中的 runkit.internal_override 设置。

参数

funcname: Name of function to redefine
arglist: New list of arguments to be accepted by function
code: New code implementation
closure: A closure that defines the function.
return_by_reference: Whether the function should return by reference.
doc_comment: The doc comment of the function.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

更新日志

版本	说明
runkit 1.0.4	An alternative syntax expecting a `closure` has been added.
runkit 1.0.4	The optional parameters `return_by_reference` and `doc_comment` have been added.

范例

Example #1 A runkit_function_redefine() example


<?php
function testme() {
  echo "Original Testme Implementation\n";
}
testme();
runkit_function_redefine('testme','','echo "New Testme Implementation\n";');
testme();
?>

以上例程会输出：

Original Testme Implementation
New Testme Implementation

参见

runkit_function_add() - Add a new function, similar to create_function
runkit_function_copy() - Copy a function to a new function name
runkit_function_rename() - Change a function's name
runkit_function_remove() - Remove a function definition
runkit_method_redefine() - Dynamically changes the code of the given method

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User Contributed Notes 2 notes

down

lucato at gmail dot com ¶

12 years ago


Note to users: language constructs (eval, die, exit, isset, unset, echo etc.) which might be confused with functions, cannot be renamed or redefined even with runkit.internal_override.

down

corentin dot delorme at linagora dot com ¶

17 years ago


Here is another example with a parameter:

<?php

function hello_world($word) {
  echo "Original Hello World: $word\n</br>";
}

$helloWorld = 'echo "Redefined Hello World: $word\n</br>";';

hello_world('test1');

runkit_function_redefine('hello_world', '$word', $helloWorld);

hello_world('test2');

?>

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